Method and equipment for producing driving power in a paper or board mill

Abstract

A paper or board mill includes a drying section, which includes at least one drying cylinder group and at least one impingement drying unit (PK). The method uses a turbine engine (10), the combustion gases (1) of which are conducted at least into the impingement drying unit (PK) as impingement air.

The invention claimed is: 
     
       1. A method for producing driving power in a paper or board mill wherein the paper or board mill includes a drying section, which includes at least one drying cylinder group, which is formed by a plurality of drying cylinders and a plurality of suction rolls, and at least one impingement unit positioned to blow impingement drying air on one of said plurality of drying cylinders, the method comprising the steps of:
 using a turbine engine having a suction side, to produce combustion gases which are supplied as impingement drying air to the at least one impingement unit; and 
 connecting the suction side of the turbine engine to the plurality of suction rolls to supply negative pressure to said plurality of suction rolls. 
 
     
     
       2. The method of  claim 1 , wherein the one of said plurality of drying cylinders is formed by a suction roll. 
     
     
       3. The method of  claim 1 , wherein the suction side of the turbine engine also supplies negative pressure to components in the paper or board mill other than the plurality of suction rolls. 
     
     
       4. The method of  claim 1  wherein said at least one impingement unit produces re-circulated air which is conducted into a steam generation plant, and wherein the steam generation plant is used to produce steam which is supplied to the plurality of drying cylinders. 
     
     
       5. The method of  claim 1  wherein the turbine engine has a pressure side which supplies compressed air to a pressure network of the paper or board mill. 
     
     
       6. The method of  claim 1 , wherein the the turbine engine is connected to a generator, and produces electricity. 
     
     
       7. A paper or board mill comprising:
 a drying section, which includes at least one drying cylinder group, which is formed by a plurality of drying cylinders and by a plurality of suction rolls; 
 at least one impingement unit, the impingement unit positioned to blow impingement drying air on one of said plurality of drying cylinders; 
 a turbine engine having a suction side, the turbine engine connected to communicate combustion gases to the said at least one impingement unit as impingement drying air; and 
 a suction network connected to at least the plurality of suction rolls of the drying section and connected to the suction side of the turbine engine, whereby negative pressure produced by the turbine engine is conducted to said plurality of suction rolls. 
 
     
     
       8. The paper or board mill of  claim 7 , wherein the one of said plurality of drying cylinders, is formed by a suction roll. 
     
     
       9. The paper or board mill of  claim 7 , wherein a suction network of other components needing negative pressure in the paper or board mill is further connected to the suction side of the turbine engine, whereby negative pressure produced by the turbine engine is conducted to said other components. 
     
     
       10. The paper or board mill of  claim 7 , further comprising a steam generation plant connected to receive re-circulated air from the said at least one impingement unit; and wherein the steam generation plant is in steam supplying relationship to the plurality of drying cylinders. 
     
     
       11. The paper or board mill of  claim 7 , further comprising a pressure network connected to a pressure side of the turbine engine, whereby positive pressure produced by the turbine engine is conducted to said pressure network. 
     
     
       12. The paper or board mill of  claim 7 , further comprising an electric generator, which is connected to the turbine engine. 
     
     
       13. A method of integrating a turbine engine into a paper or board mill comprising the steps of:
 operating a turbine engine to release energy from fuel and producing a flow volume of combustion gases, the turbine engine having a suction side producing a negative pressure source, and a supercharger producing compressed air; 
 conducting the combustion gases at least into at least one impingement drying unit positioned to blow impingement drying air on one of a plurality of drying cylinders in a dryer section of the paper or board mill and using the combustion gases as impingement drying air; 
 connecting a plurality of suction rolls in the dryer section to a negative pressure network which supplies negative pressure from the suction side of the turbine engine. 
 
     
     
       14. The method of  claim 13 , further comprising a pressure network connected to the supercharger of the turbine engine, whereby compressed air produced by the turbine engine is conducted to said pressure network.